[Bug #917] Fixed bug changing visibility of PlanningData default constructor to public.

BTW, added information about class failing in exception.

FEA: ItEr72S04BugFixing

navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/PlanningData.java

@@ -51,7 +51,7 @@ public class PlanningData extends BaseEntity {
 
     private BigDecimal progressByNumHours;
 
-    protected PlanningData() {
+    public PlanningData() {
 
     }
 

navalplanner-business/src/main/java/org/navalplanner/business/util/deepcopy/DeepCopy.java

@@ -33,10 +33,10 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Set;
 import java.util.SortedSet;
 import java.util.TreeSet;
+import java.util.Map.Entry;
 
 import org.apache.commons.lang.Validate;
 import org.hibernate.proxy.HibernateProxy;
@@ -365,7 +365,8 @@ public class DeepCopy {
             throw new RuntimeException(e);
         } catch (NoSuchMethodException e) {
             throw new IllegalArgumentException(
-                    "could not invoke default no-args constructor", e);
+                    "could not invoke default no-args constructor for "
+                            + klass, e);
         }
         try {
             return constructor.newInstance();